Brother MFC9700 Service Manual page 150

Messages on the LCD
(In the 1st row)
TONER EMPTY
(In the 2nd row)
Open cover, then replace
new toner cartridge
TONER LOW
If only an alarm beep is heard without any message on the LCD when the machine is powered up, the
ROM or RAM will be defective.
*
The toner sensor has detected that there is no toner in the
cartridge or that no toner cartridge is loaded. If this message
appears, recording is no longer possible.
The toner sensor has detected that there is not enough toner.
*On machines equipped with a single-row LCD, these messages appear alternately.
VI - 4
Probable Cause